Frame for sight testing



(No Model.)

J. K. UNDERWOODM FRAME FOR SIGHT TESTING SPEGTAOLES. No. 480,763. PatentedJune 24, 1890.

NTTED STATES PATENT OF ICE.

JOHN K. U NDEINVOOD, OF GENEVA, NEW YORK, ASSIGNOR TO THE AMERI- CAN OPTICAL COMPANY, OF SOUTIIBRIDGE, MASSACHUSET"S.

FRAME FOR SIGHT-TESTING SPECTACLES.

SPECIFICATION forming part of Letters Patent No. 430,763, dated June 24, 1890.

Application filed February 19, 1890- Serial No. 341,240. (No model.)

To ctlZ whom it may concern: of two plates or strips of suitable metal which Be it known that I, JOHN K. UNDERWOOD, meet at aright angle, and oneof which strips, of Geneva, county of Ontario, State of New as a forms the top face of the bar, while the York, a citizen of the United States, have inother constitutes the front face a as shown.

vented certain new and useful Improvements Within therecess thus constituted on the 55 in Frames for Sight -Testing Spectacles, of rearward side of thebar by this saidinvertedwhich the following is a full, clear, and exact L-shaped metal strip I locate the screw-rod description,reference bcinghad to the accom- D, and I attach the lens-frames to their re panying drawings, forming part of this specispeetive reverse threads (Z d on the rod D by [0 fication, in whichmeans of nuts d which play on said threads 60 Figurel is afront elevation of a sight-test and which are united to clips (1 a lip cl of in g spectacle-frame containing my invention. which engages and rides the upper face a of Fig. 2 is a rear elevation of the same. Fig. 3 the bar A. The clips are fixed on the lensis a top view or plan of the same. Fig. 4c isa frames, as shown,and aflangeb on said frames 15 vertical section on the line as m, Fig. 1. Fig; engages and traverses the front face a of the 6 5 5 is a similar section on the line y y, Fig. 2. bar A. The clips d are preferably formed Fig. 5 is an enlarged section of the upper of spring metal, and the lens-frames are held portion of Fig. 5, and 6 is a plan of the to proper position on the bar A by the lip (Z nose-piece detached. on each clip and the flanges b on the lens- My invention consists in the devices hereframes. The rod Dhas the cnstomarythumb- 7o inafter described, whereby the lens-holding pieces (1 at its ends beyond the bar A, by frames are adjustablymonnted on their supwhich the rod may be turned to adjust the porting bar, and whereby the nose-piece is lens-frames on the bar. 'lhelipsd111ayse1've given adj ustability, and as more particularly in the nature of pointers to traverse a scale recited in the claims. marked on-the upper face of the bar, as shown A is the main bar of the frame upon which in Fig. 3. the various working parts are mounted. E is my improved nose-piece, and. this fea- B B are the lens-holding frames,which may ture of my invention consists in a bar e, car be in any of the well-known forms, and which rying upon its rearward-end the nose-bridge 0 are mounted on the bar A so as to be adj uste, and passing horizontally through a sleeve able toward and from each other thereon. e fixed on the lower end of the vertically-ad- C is the arm carrying the nose-piece, and j ustable arm C. A set-screw e works transarranged on the bar A midway between the versely in the sleeve e to hold the bar 9 in lens-frames, and having adjnstability vertiits adjusted position in the sleeve. The bar 5 oally on the bar by means of a bridge a on 6 may have an index-scale on its upper face, the bar, under which the arm C passes, and a as shown in Fig. 6, and an end of the sleeve set-screw a in said bridge working on the arm, may serve in connection with this scale to in whereby the arm is held rigidly in its desired dicate the distance of the nose-bridge e from position. the plane of the lenses when the testing 40 For the purposes of my invention any other frames are placed on the face of an individual. known means forgiving vertical adj ustability What I claim as my invention, and desire to the arm C on the bar may be employed. to secure by Letters Patent, is-.

A feature of my invention consists in the 1. In a frame for sight-testing spectacles, bar A when formed or provided with a recess the combination of a bar A, recessed longi- 45 a on its rearward side extending longituditudinally at a on its rearward face, the screw 5 nally from end to end of the bar, as shown, rod D, located in said recess, the lens-frames and adapted to receive and inclose the screw B, having the flanges b,'engaging the front rod D, which actuate-s the lens-frames B. The face of said bar, and the clips dflfixed on said bar A may be given any desired form or outlens-frames and havinga lip (1%, engaging the 50 line in cross-section; but I prefer to form it upper face of said bar, together with nuts (1 mo carried by said clips and Working on said screw-rod, substantially as set forth.

2. In a frame for sight-testing spectacles,

the combination, with the lens-frames B and their adjustingscrew rod D, of the bar A, composed of the plates a and a constituting,

respectively, the top and front faces of said bar and meeting at substantially a right angle, said screw-rod being behind the front and beneath the top plate, and a flange on each lens-frame engaging the front plate of the bar, substantially as and forthe purpose set forth. 

